Pneumatic tire



July 27, 1926. I

F. A. KRUSEMARK PNEUMATIC TIRE, v

Filed April 3, 1926 'UiqIL.

INVENTO'R )Erusemcufi,

ATTORNEY Patented July 27, 1926.

u mT o STATES, PATENT OFFICE.

' .mnnmcx L KRUSEMARK, OF AKRON, OHIO, ASSIGNOB TO LAMBERT TIRE & BUB- V BER 60., OF BABBEBTON,-OHIO, A CORPORATION OF ARIZONA.

rnnu mzrxc Tran.

I Application flied April 3, 1928. Serial'fio. 89,-516.

My invention has for its objectto provide certain new and useful improvements in iunct-ure;resisting-;: pneumatic tires of the nd wherein the tread'is of greater thick- 5 ness than standard practice and is provided sides of'the tread, the recesses aligning with the transverse o enings and of a greater area than the diameter of the openings, thereby leaving a series of lugs between 5 adjacent openings whose purpose is to guard the entrancesto'the openings and prevent or reducecracking of the rubber at theentrances of the openings as well as to serve as traction lugs'when the tire is running over 0 soft ground, such as sand or mud,

More subordinately the invention. resides in those novel features of construction, COIllbin'ation and arrangement of parts, all of which'will be first fully described,'then be 5. specifically pointed out in the appended c panying drawing, in which Figure l is a sectional perspective view of a portion of a tire showing one embodiment of myinventionv (the openings in this embodiment passing entirely through .from side to side).

Figure '2 is a sideelevation of the .struc ture shown inFigure 1.

Figure 3 is. a lan .view of another'embodiment of the nvention (in this embodiment. the openings passing but partly throuh the tread and being staggered).

In t e drawing in which like numerals of 0 reference indicate: like parts in all the figures,

,the usual practice, and 2 indicates the tread which in the present instance is built thicker than standard practice and is provided with overheating with consequent disintegration.

4 designates notches or recesses formed in aims, reference being had to the accom- 1 represents the carcass of the tire, which may be built up in accordance with.

with the various openings. These recesses or notches are of greater area in elevation than the diameter of the openings whereby lugs 5 are left between adjacentopenings,

these lugs serving the two-fold purpose of FliEidd iD the tread portion of the them alignment protecting the tire'carcass at the mouth of p the openings, and as traction lugs when the 'tire isrolling on a soft road bed as for instance in sand or mud.

, Itshould, of course, be understood that the openin s 3 may extend entirely through the tread rpmside to side (and this is a preferred embodiment) or they may be blind openings extending but partly into the tire tread as indicated at 3 in Figure 3, and if desiredthe openings at one side may be staggered with relation to those at the other side as indicated in Figure 3.

In my present invention I do not desire to be understood'as limited to any particular depth of openings 3, the essential feature of the present invention being the provision of the. notches or recesses 4and the intermediate lugs 5, the notches or recesses being arranged to align up with the openings, or in it is thought the construction, operation and advantages of my invention will be clear to those skilled in the art to which it relates.

What I claim is: 1. Pneumatic tires thickened tread, said tread havin transverse openings, the entrances to w ich lie 'to either side of the mid-plane of the tire,

having a carcass withsaid tread having side walls andbeing provided with recesses or notches at the junction ofthe tread face and side walls, said recesses or notches being of greater width than the diameter of said openings, said 0 enings beginning at the inner surfaces of t e recesses or 'notches and extending toward the opposite side. of the tread.

2, In pneumatic tires, a carcass having a thickened weed, said tread having opentread provided with transverse openings in entering-from its sides and be g p'nofrom the sides of the tread and vhaving alvi, edwith reesses or notches alignin -with fternetel y disposed. notches end lugs, the 10 the enter ends of said openings, ereby openings extendin inwardly from the ileaving'ln s at either side of each opening notches, and rin'gfiikebeads surrounding o guard t 'e entrances to said openings. the openings-within the notches.

.3. Apneumatic tire having a thickened FREDERICK A. KRUSEMARK. 

